we're having the biggest event of the year and our thread is still glued to page 10...?

Some rewards from "Emergency Dispatch Mission: Ruins Reclamation" event are locked behind skystone wall. 36 - rewards, except gifts. 125 - cost to get one. 7 - days event is going. 5 - free tries every day. 40/60 - currency for clearing normal/hard.
36*125=4500/7/60=10,71 times to clear per day while we have 5. Other way is 7*5*60=2100 currency, meaning we can buy less than half, 2100/125=16,8, 16 rewards out of 36 for free.